IntelliSense: Remove tables from return value section

# IntelliSense: Remove tables from return value section

The Return Value section of a number of methods (particularly the Compare method) includes a table that lists possible return value ranges. The table creates a broken experience for IntelliSense. The tables need to be removed and replaced with text.

PR dotnet/dotnet-api-docs#245 changes the return value section of the [IComparer.Compare](https://docs.microsoft.com/en-us/dotnet/api/system.collections.icomparer.compare?view=netframework-4.7.2#System_Collections_IComparer_Compare_System_Object_System_Object_) method, which can be examined in OPS IntelliSense builds.

//cc @mairaw @weshaggard